a swan song

swan song

A final performance, product, or accomplishment before someone or something stops creating work or products, as due to death, retirement, closure, etc. From the ancient belief that swans issue a beautiful song-like sound just before they die. Reaching, and often surpassing, the dizzying heights of her first novel, this is a remarkable swan song for the accomplished author. Their latest album, the swan song of the legendary rock group, is unfortunately not one of their best.
See also: song, swan
Farlex Dictionary of Idioms.

a swan song

A swan song is the last performance or piece of work that someone does in their career. He had made up his mind that this show was going to be his swan song. Note: This expression developed from a belief that a dying swan sings.
See also: song, swan
Collins COBUILD Idioms Dictionary, 3rd ed.
See also:
  • swan song
  • (Someone or something) called, they want their (something) back!
  • reassign
  • reassign to
  • reassign to (something)
  • get credit for
  • get credit for (something)
  • the jewel in (someone's or something's) crown
  • the jewel in someone's/something's crown
  • steal thunder
References in periodicals archive
Chalkline across my door, tells me not to run and look both ways and a heart in needle tip to stitch your face onto my finger by Emma Tillyer A SWAN SONG FOR A BLACKBIRD How could nature have got it so wrong, As to give a blackbird a 'swan song'?
One thing is for certain, however, the panic merchants won't succeed in creating a swan song for this lovely part of the Scottish coastline.
A Swan Song by Janette Owens Oneswan Productions, June 2000, $12.00, ISBN 0-967-73120-8
But having said that, what you are reading here is a swan song of sorts, and probably as enjoyable to read as a swan song is to hear.
As dust and gas disappear into a black hole, they emit a swan song of X rays.